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An infection can definitely increase your heart rate. Especially if you have a fever. Your body is working hard to fight off the infection, and in return, your heart rate rises. This is also why you get out of breath when your sick. You're body is doing more to fight infections, even when your not!
heart beat of a mouse is 650 times per minute
1 second
A fly has to beat its heart faster than larger animals to support the blood circulation. Flies can beat their hearts at about 5 Hertz.
Sometimes you can get scared,frustarated or upset and your heart rate will increase.